I thought it was Bradbury but alsoforsome reason thought it might be
Clarke...  

Quite possibly either, I can't remember either, but the name of the 
particular story is "The Sound of Thunder".

Perhaps that helps?

Joshua "Gargoyle" Trujillo
"Stone Cold Protector of the Righteous"
"Owner of The Anime Bar and Grille - Now Pine Scented"

Come to The Anime Bar and Grille!
Newly relocated to 
http://www.geocities.com/Tokyo/Towers/1509
We Bake Our Stories Fresh Daily!

______________________________________________________
Get Your Private, Free Email at http://www.hotmail.com